"Afterimage" is the 153rd episode of the television series Star Trek: Deep Space Nine, the third episode of the seventh season. It was first broadcast on October 14, 1998.

In addition to coping with the memories of her symbiont's past lives, Ezri Dax must deal with the range of reactions her presence generates on Deep Space Nine. Her presence is not looked highly upon, as many people are unsure how to feel about Ezri. Worf has the worst reaction, even threatening fellow friends and officers. Garak, who is also not taking Ezri well, suffers problems of his own when acute claustrophobia, worse than ever, strikes him down.

At the end of the episode, Ezri leaves her position aboard the USS Destiny and becomes Deep Space Nine's official counselor. Because of her extensive Starfleet experience from her past lives, Ezri receives a promotion from ensign to lieutenant junior grade.

...
Wikipedia